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/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.activemq.filter;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.regex.Pattern;
import javax.jms.JMSException;
/**
* A filter performing a comparison of two objects
*
*
*/
public abstract class ComparisonExpression extends BinaryExpression implements BooleanExpression {
public static final ThreadLocal CONVERT_STRING_EXPRESSIONS = new ThreadLocal();
boolean convertStringExpressions = false;
private static final Set REGEXP_CONTROL_CHARS = new HashSet();
/**
* @param left
* @param right
*/
public ComparisonExpression(Expression left, Expression right) {
super(left, right);
convertStringExpressions = CONVERT_STRING_EXPRESSIONS.get()!=null;
}
public static BooleanExpression createBetween(Expression value, Expression left, Expression right) {
return LogicExpression.createAND(createGreaterThanEqual(value, left), createLessThanEqual(value, right));
}
public static BooleanExpression createNotBetween(Expression value, Expression left, Expression right) {
return LogicExpression.createOR(createLessThan(value, left), createGreaterThan(value, right));
}
static {
REGEXP_CONTROL_CHARS.add(Character.valueOf('.'));
REGEXP_CONTROL_CHARS.add(Character.valueOf('\\'));
REGEXP_CONTROL_CHARS.add(Character.valueOf('['));
REGEXP_CONTROL_CHARS.add(Character.valueOf(']'));
REGEXP_CONTROL_CHARS.add(Character.valueOf('^'));
REGEXP_CONTROL_CHARS.add(Character.valueOf('$'));
REGEXP_CONTROL_CHARS.add(Character.valueOf('?'));
REGEXP_CONTROL_CHARS.add(Character.valueOf('*'));
REGEXP_CONTROL_CHARS.add(Character.valueOf('+'));
REGEXP_CONTROL_CHARS.add(Character.valueOf('{'));
REGEXP_CONTROL_CHARS.add(Character.valueOf('}'));
REGEXP_CONTROL_CHARS.add(Character.valueOf('|'));
REGEXP_CONTROL_CHARS.add(Character.valueOf('('));
REGEXP_CONTROL_CHARS.add(Character.valueOf(')'));
REGEXP_CONTROL_CHARS.add(Character.valueOf(':'));
REGEXP_CONTROL_CHARS.add(Character.valueOf('&'));
REGEXP_CONTROL_CHARS.add(Character.valueOf('<'));
REGEXP_CONTROL_CHARS.add(Character.valueOf('>'));
REGEXP_CONTROL_CHARS.add(Character.valueOf('='));
REGEXP_CONTROL_CHARS.add(Character.valueOf('!'));
}
static class LikeExpression extends UnaryExpression implements BooleanExpression {
Pattern likePattern;
/**
*/
public LikeExpression(Expression right, String like, int escape) {
super(right);
StringBuffer regexp = new StringBuffer(like.length() * 2);
regexp.append("\\A"); // The beginning of the input
for (int i = 0; i < like.length(); i++) {
char c = like.charAt(i);
if (escape == (0xFFFF & c)) {
i++;
if (i >= like.length()) {
// nothing left to escape...
break;
}
char t = like.charAt(i);
regexp.append("\\x");
regexp.append(Integer.toHexString(0xFFFF & t));
} else if (c == '%') {
regexp.append(".*?"); // Do a non-greedy match
} else if (c == '_') {
regexp.append("."); // match one
} else if (REGEXP_CONTROL_CHARS.contains(new Character(c))) {
regexp.append("\\x");
regexp.append(Integer.toHexString(0xFFFF & c));
} else {
regexp.append(c);
}
}
regexp.append("\\z"); // The end of the input
likePattern = Pattern.compile(regexp.toString(), Pattern.DOTALL);
}
/**
* @see org.apache.activemq.filter.UnaryExpression#getExpressionSymbol()
*/
public String getExpressionSymbol() {
return "LIKE";
}
/**
* @see org.apache.activemq.filter.Expression#evaluate(MessageEvaluationContext)
*/
public Object evaluate(MessageEvaluationContext message) throws JMSException {
Object rv = this.getRight().evaluate(message);
if (rv == null) {
return null;
}
if (!(rv instanceof String)) {
return Boolean.FALSE;
// throw new RuntimeException("LIKE can only operate on String
// identifiers. LIKE attemped on: '" + rv.getClass());
}
return likePattern.matcher((String)rv).matches() ? Boolean.TRUE : Boolean.FALSE;
}
public boolean matches(MessageEvaluationContext message) throws JMSException {
Object object = evaluate(message);
return object != null && object == Boolean.TRUE;
}
}
public static BooleanExpression createLike(Expression left, String right, String escape) {
if (escape != null && escape.length() != 1) {
throw new RuntimeException("The ESCAPE string litteral is invalid. It can only be one character. Litteral used: " + escape);
}
int c = -1;
if (escape != null) {
c = 0xFFFF & escape.charAt(0);
}
return new LikeExpression(left, right, c);
}
public static BooleanExpression createNotLike(Expression left, String right, String escape) {
return UnaryExpression.createNOT(createLike(left, right, escape));
}
@SuppressWarnings({ "rawtypes", "unchecked" })
public static BooleanExpression createInFilter(Expression left, List elements) {
if (!(left instanceof PropertyExpression)) {
throw new RuntimeException("Expected a property for In expression, got: " + left);
}
return UnaryExpression.createInExpression((PropertyExpression)left, elements, false);
}
@SuppressWarnings({ "rawtypes", "unchecked" })
public static BooleanExpression createNotInFilter(Expression left, List elements) {
if (!(left instanceof PropertyExpression)) {
throw new RuntimeException("Expected a property for In expression, got: " + left);
}
return UnaryExpression.createInExpression((PropertyExpression)left, elements, true);
}
public static BooleanExpression createIsNull(Expression left) {
return doCreateEqual(left, ConstantExpression.NULL);
}
public static BooleanExpression createIsNotNull(Expression left) {
return UnaryExpression.createNOT(doCreateEqual(left, ConstantExpression.NULL));
}
public static BooleanExpression createNotEqual(Expression left, Expression right) {
return UnaryExpression.createNOT(createEqual(left, right));
}
public static BooleanExpression createEqual(Expression left, Expression right) {
checkEqualOperand(left);
checkEqualOperand(right);
checkEqualOperandCompatability(left, right);
return doCreateEqual(left, right);
}
@SuppressWarnings({ "rawtypes" })
private static BooleanExpression doCreateEqual(Expression left, Expression right) {
return new ComparisonExpression(left, right) {
public Object evaluate(MessageEvaluationContext message) throws JMSException {
Object lv = left.evaluate(message);
Object rv = right.evaluate(message);
// If one of the values is null
if (lv == null ^ rv == null) {
if (lv == null) {
return null;
}
return Boolean.FALSE;
}
if (lv == rv || lv.equals(rv)) {
return Boolean.TRUE;
}
if (lv instanceof Comparable && rv instanceof Comparable) {
return compare((Comparable)lv, (Comparable)rv);
}
return Boolean.FALSE;
}
protected boolean asBoolean(int answer) {
return answer == 0;
}
public String getExpressionSymbol() {
return "=";
}
};
}
public static BooleanExpression createGreaterThan(final Expression left, final Expression right) {
checkLessThanOperand(left);
checkLessThanOperand(right);
return new ComparisonExpression(left, right) {
protected boolean asBoolean(int answer) {
return answer > 0;
}
public String getExpressionSymbol() {
return ">";
}
};
}
public static BooleanExpression createGreaterThanEqual(final Expression left, final Expression right) {
checkLessThanOperand(left);
checkLessThanOperand(right);
return new ComparisonExpression(left, right) {
protected boolean asBoolean(int answer) {
return answer >= 0;
}
public String getExpressionSymbol() {
return ">=";
}
};
}
public static BooleanExpression createLessThan(final Expression left, final Expression right) {
checkLessThanOperand(left);
checkLessThanOperand(right);
return new ComparisonExpression(left, right) {
protected boolean asBoolean(int answer) {
return answer < 0;
}
public String getExpressionSymbol() {
return "<";
}
};
}
public static BooleanExpression createLessThanEqual(final Expression left, final Expression right) {
checkLessThanOperand(left);
checkLessThanOperand(right);
return new ComparisonExpression(left, right) {
protected boolean asBoolean(int answer) {
return answer <= 0;
}
public String getExpressionSymbol() {
return "<=";
}
};
}
/**
* Only Numeric expressions can be used in >, >=, < or <= expressions.s
*
* @param expr
*/
public static void checkLessThanOperand(Expression expr) {
if (expr instanceof ConstantExpression) {
Object value = ((ConstantExpression)expr).getValue();
if (value instanceof Number) {
return;
}
// Else it's boolean or a String..
throw new RuntimeException("Value '" + expr + "' cannot be compared.");
}
if (expr instanceof BooleanExpression) {
throw new RuntimeException("Value '" + expr + "' cannot be compared.");
}
}
/**
* Validates that the expression can be used in == or <> expression. Cannot
* not be NULL TRUE or FALSE litterals.
*
* @param expr
*/
public static void checkEqualOperand(Expression expr) {
if (expr instanceof ConstantExpression) {
Object value = ((ConstantExpression)expr).getValue();
if (value == null) {
throw new RuntimeException("'" + expr + "' cannot be compared.");
}
}
}
/**
* @param left
* @param right
*/
private static void checkEqualOperandCompatability(Expression left, Expression right) {
if (left instanceof ConstantExpression && right instanceof ConstantExpression) {
if (left instanceof BooleanExpression && !(right instanceof BooleanExpression)) {
throw new RuntimeException("'" + left + "' cannot be compared with '" + right + "'");
}
}
}
@SuppressWarnings({ "rawtypes", "unchecked" })
public Object evaluate(MessageEvaluationContext message) throws JMSException {
Comparable lv = (Comparable)left.evaluate(message);
if (lv == null) {
return null;
}
Comparable rv = (Comparable)right.evaluate(message);
if (rv == null) {
return null;
}
return compare(lv, rv);
}
@SuppressWarnings({ "rawtypes", "unchecked" })
protected Boolean compare(Comparable lv, Comparable rv) {
Class lc = lv.getClass();
Class rc = rv.getClass();
// If the the objects are not of the same type,
// try to convert up to allow the comparison.
if (lc != rc) {
try {
if (lc == Boolean.class) {
if (convertStringExpressions && rc == String.class) {
lv = Boolean.valueOf((String)lv).booleanValue();
} else {
return Boolean.FALSE;
}
} else if (lc == Byte.class) {
if (rc == Short.class) {
lv = Short.valueOf(((Number)lv).shortValue());
} else if (rc == Integer.class) {
lv = Integer.valueOf(((Number)lv).intValue());
} else if (rc == Long.class) {
lv = Long.valueOf(((Number)lv).longValue());
} else if (rc == Float.class) {
lv = new Float(((Number)lv).floatValue());
} else if (rc == Double.class) {
lv = new Double(((Number)lv).doubleValue());
} else if (convertStringExpressions && rc == String.class) {
rv = Byte.valueOf((String)rv);
} else {
return Boolean.FALSE;
}
} else if (lc == Short.class) {
if (rc == Integer.class) {
lv = Integer.valueOf(((Number)lv).intValue());
} else if (rc == Long.class) {
lv = Long.valueOf(((Number)lv).longValue());
} else if (rc == Float.class) {
lv = new Float(((Number)lv).floatValue());
} else if (rc == Double.class) {
lv = new Double(((Number)lv).doubleValue());
} else if (convertStringExpressions && rc == String.class) {
rv = Short.valueOf((String)rv);
} else {
return Boolean.FALSE;
}
} else if (lc == Integer.class) {
if (rc == Long.class) {
lv = Long.valueOf(((Number)lv).longValue());
} else if (rc == Float.class) {
lv = new Float(((Number)lv).floatValue());
} else if (rc == Double.class) {
lv = new Double(((Number)lv).doubleValue());
} else if (convertStringExpressions && rc == String.class) {
rv = Integer.valueOf((String)rv);
} else {
return Boolean.FALSE;
}
} else if (lc == Long.class) {
if (rc == Integer.class) {
rv = Long.valueOf(((Number)rv).longValue());
} else if (rc == Float.class) {
lv = new Float(((Number)lv).floatValue());
} else if (rc == Double.class) {
lv = new Double(((Number)lv).doubleValue());
} else if (convertStringExpressions && rc == String.class) {
rv = Long.valueOf((String)rv);
} else {
return Boolean.FALSE;
}
} else if (lc == Float.class) {
if (rc == Integer.class) {
rv = new Float(((Number)rv).floatValue());
} else if (rc == Long.class) {
rv = new Float(((Number)rv).floatValue());
} else if (rc == Double.class) {
lv = new Double(((Number)lv).doubleValue());
} else if (convertStringExpressions && rc == String.class) {
rv = Float.valueOf((String)rv);
} else {
return Boolean.FALSE;
}
} else if (lc == Double.class) {
if (rc == Integer.class) {
rv = new Double(((Number)rv).doubleValue());
} else if (rc == Long.class) {
rv = new Double(((Number)rv).doubleValue());
} else if (rc == Float.class) {
rv = new Float(((Number)rv).doubleValue());
} else if (convertStringExpressions && rc == String.class) {
rv = Double.valueOf((String)rv);
} else {
return Boolean.FALSE;
}
} else if (convertStringExpressions && lc == String.class) {
if (rc == Boolean.class) {
lv = Boolean.valueOf((String)lv);
} else if (rc == Byte.class) {
lv = Byte.valueOf((String)lv);
} else if (rc == Short.class) {
lv = Short.valueOf((String)lv);
} else if (rc == Integer.class) {
lv = Integer.valueOf((String)lv);
} else if (rc == Long.class) {
lv = Long.valueOf((String)lv);
} else if (rc == Float.class) {
lv = Float.valueOf((String)lv);
} else if (rc == Double.class) {
lv = Double.valueOf((String)lv);
} else {
return Boolean.FALSE;
}
} else {
return Boolean.FALSE;
}
} catch(NumberFormatException e) {
return Boolean.FALSE;
}
}
return asBoolean(lv.compareTo(rv)) ? Boolean.TRUE : Boolean.FALSE;
}
protected abstract boolean asBoolean(int answer);
public boolean matches(MessageEvaluationContext message) throws JMSException {
Object object = evaluate(message);
return object != null && object == Boolean.TRUE;
}
}